An event multicast demonstration : Delegate event : Delegate C# Examples

    
using  System;  
  
delegate  void  MyEventHandler();  
  
class  MyEvent  {  
    public  event  MyEventHandler  SomeEvent;  
  
    public  void  OnSomeEvent()  {  
        if(SomeEvent  !=  null)  
            SomeEvent();  
    }  
}  
  
class  MouseEvent  {  
    public  void  MouseEventHandler()  {  
        Console.WriteLine("Event  received  by  MouseEventHandler  object");  
    }  
}  
  
class  KeyEvent  {  
    public  void  KeyEventHandler()  {  
        Console.WriteLine("Event  received  by  KeyEventHandler  object");  
    }  
}  
  
class  MainClass  {  
    static  void  handler()  {  
        Console.WriteLine("Event  received  by  EventDemo");  
    }  
  
    public  static  void  Main()  {    
        MyEvent  evt  =  new  MyEvent();  
        MouseEvent  xOb  =  new  MouseEvent();  
        KeyEvent  yOb  =  new  KeyEvent();  
  
        evt.SomeEvent  +=  handler;  
        evt.SomeEvent  +=  xOb.MouseEventHandler;  
        evt.SomeEvent  +=  yOb.KeyEventHandler;  
  
        evt.OnSomeEvent();  
        Console.WriteLine();  
  
        evt.SomeEvent  -=  xOb.MouseEventHandler;  
        evt.OnSomeEvent();  
    }  
}